Gun for dispensing plastic material



Patented Apr. 3, 1951 GUN Eon msransmo PLASTIC.- MATERIAL,

Clem strohmeieri flleveland, Ohio,- assi'gnor of 1 one-third to'Ar-nold J. Rose and: two-thirds-to- Melvin Rose ApplicationAusust 28, 1948.! Serial. No. 4161 .88

7 Claims;

My invention relates, to guns. for dispensing, lastic, materials such. as caulking; guns and the like An object of my invention, is to provide antimproveci arrangement oi the operating parts, of. a plastic, dispensing gun iacilitati'ng and, improv-- n the. use and operation of the gun- Another, object. is the, provision of, improved. perating mechanisms tor a. gun. in which the o erating, levers. are; disposed, for a maximum oi universal; use and for, conrenicnce. o he op rator- Anoth robject is the pr vision, oi an improxiea un havin operating; levers and a release IBMQI soarranged and associated that the operator. may. with a minimum of eftortand movement, gov from, man pulating the. operating levers to op rating, the release. lever,v and vice versa,

Another obiectis.theprovisiop oi: an improved un. for p nsin pla tic material. hav ng; par s arranged, nd associated toprovidte for; y and ready mani ulation of the gun and for its: uni

versal, use in. practice.

Another, ohjectpis the provision. of an improved structure. facilitating the fabrication and assem-- bly of. the operafine parts in a. gun.

Another obieet is. the. provision. oi. an improved gun structure which is economical to mahiiiac ture and eihcient in use... Another object is the provision Qi an improved un for dispensing plastic material havin a structure and operation not. heretofore known and produ ing re ults not her t ore bt inable hnother object, is the provision of animproved structure. facilitating the quick, economical and ready assembly and disassembly' of the operatin mecha ism of, a gun of this. character.

Other objects and a. fuller. understandingof the invention. may be, had by referring to the fol-o lowing description and claims, takenin conjunca tion with the accompanying drawings, in. which;

Figure 1 is. a sideview olfa plastic dispensing; gun embodying the. preferred form of my'invene tion; 1

Figure 2 is. an enlarged sectional view of, the riehtrhandend of: my gun sh wn in F gure and is a section takenthrough line 27-2 of Figure, 1, the parts shown in. Figure 2' being removed from. e cylinder or barrel'oi" the sun or s mpl ty of illustration; V

a Figure 3 is an end view of the. parts; shown inv F ure 2; looking in the. direction. of the arr w 3-4 f Figure 2; I

Figur i is a cr ss=s ctional v ew of the parts shown in Figure 2 anctlo'oking in the direction of the arrows 4-4 of Figure 2;

Figure 51s a longitudinal sectional, view of the parts shown in Figure 2 looking in' the direction of the arrows, and taken along the line of; 5'*5 of Figure. 2,;

Figure 6 is a separate view-of the cap, member used for mounting; the operating'parts to, the ey1-= inder f my un;

F gure, 7 is a. i w o the. spacer b ock. sed. in e. moun in of h opera ng par s n gun;

Figure. 8 s a detailed: iew sho n he otched ndof one of he support; m m e s. use fo sup; porting, the operati g. lev s: o my de ice; anti gure 91s a aet i' djv e sr'sho ihs the no e i; ends of; a support. memb r for supp'o hs the; de ent plate and. releasing, handle of y s n.-

My plasticld pepsins sun mbodies a crimson r barrel U r the usual, t pe and wh h; is sed;

for receiving the plastic material, such as. caulk; mg material r grease, dispensool from the. gun'- A n zzle 120i usual f rm. is mou te i on th forwardend ofcylinder ll, wherebyplast material contained. in the cylinder l lo s iecteol' out through t e. open end of" nozzle l2, upo oper t" n o th un- The forward n o the cyl nder I is re movable to, provide for loading: the. un with, ala ticmateriall, J v e inserted. into the front choc; ff. plastic material may be drawn. or s .ckool n o he un y in er on of; the nozzle into. a coptainerv of the material by revers ng the. op ation. oi the piston. The. piston. [3 i mounted, within the i der U to reciprocate. ther inin. he; sual:

mann r A piston rod .4 connec d to the piston t xt nds. axially oi the cyl nd r. ljl. anti-rearwardly ir m the rearward end. of t e cylin er Ho vThe piston rod; A i advanc d forwardl f 7 s eps or ncrements by a ieed s plate. 201- The feeding plate at is r he ahele-irietion tape,

that, the, plate 2.0 has. an opening therein slightly larger th n. hecro'ss section ofv the. rod, l4;v the pr ferred embodiment the rod 14, s square in cross section and, theopenine in f ding, plat 20 is; likewise squar fit of rod. l he penin n plate 20, is such that he p a e 211 V at right anglosto the axis. o rod 1'4 the. rod it may freely slide through, the open ng. in the p ate Upon ilting: of pla e. 20 ut oi this righ ngle position. relativeto mod the edge oi. the. plate 0 on. the; sides oi the op ning, th i n iteinto' nd. rictiona ly engage thesuriace il t e ods so th i warri m veme t oi the plate 2.0; that let towarci the. left o 'the sun. nolrieur os ivelr advances the rod: 1 and; mo es t e piston. 13 or wardly t elect p astic. match from. the gun, seen Figure 2;, ieecline plate 2." extends to one side of rod I4 more than the other side to provide an engaging surface for the tilting of plate 20.

To recurrently tilt plate 20 at an angle and to move it forwardly toward the cylinder Ii, there is provided a pair of crank arm levers I and I6. These crank arm levers I5 and I6 each have an outer arm forming a handle movable toward and away from the outer arm forming the handle of the other lever. The handle portions of levers I5 and I6 are dimensioned so that the hand of the operator may grip both of them and by squeezing his hand cause the levers to move relative to each other. The inner arms of levers I5 and I6 are directed toward each other and are pivotally interconnected through a collar I3 and bolts I9. Bolts I9 extend through holes provided in the overlapping inner arms of the levers and are threadably engaged in a collar I8. The collar I8 is carried in a sliding fit on the piston rod I4 so as to be reciprocally movable relative to the cylinder. Thus the levers I5 and I6 are pivotally interconnected and are connected to the collar I8. The crank arm lever It at the end of its inner arm has a crosspice or connecting portion IT. This crosspiece I1 is disposed to move against the outer edge of feeding plate 26 so as to-tilt the feeding plate 26 and to move it forwardly upon movement of the handles of levers I5 and I6 toward each other. As the handle por tions of levers I5 and I6 are moved toward each other, the inner arms of levers I5 and I6 swin forwardly toward the cylinder. Upon this forward movement of the inner arms, portion I'l tilts the feeding plate into gripping engagement with rod I4, and the collar I8 together with portion I'I advance. the feeding plate forwardly and thus move the rod I4 forwardly to advance the pistonl3.

Fulcrum support is provided to the respective levers I5 and I6 by means of support members 22. and 23. A pivot connection 24 is provided for connecting support member 22 to lever 15, and a pivot connection 25 is provided for connecting lever I6to support member 23.. Pivot connections 24 1and125 are simply provided by piercing holes at the location'where the inner arms and outer.

arms of the levers meet, andby looping the metal straps of which support members 22 and 23 are comprised through these openings, as shown in the drawing. Support members 22 and 23 are each made up of a strip of metal bent back upon itself and having a loop extending through the openings at the location of the fulcrum for each lever. Inasmuch as the inner arms of the levers I5 and I6 are pivotally interconnected, the fulcrum supports of the levers must be able to move laterally outward, that is, away from rod #4, when the handles of levers I5 and I6 are gripped and moved toward each other. In the preferred embodiment of my invention this lateral dis-. placement of the fulcrum of the crank arm levers provided by the support members 22 and 23 and pivot connections 24 and 25. Support members 22 and 23, being made of strips of metal, are, adapted'to .flex so as to resiliently spread apart when the handles are moved toward each other. Also the loose fitof the parts at the pivot, connections 24 and 25 permits a small give or-lateral displacement. As thepivot connections 24 and 25 are positioned at a distance from the rear end of the cylinder, there is room for this flexing of the support members and for the required lateral movement of the fulcrum support provided to the crank arm levers I5 and I6.

"Means for anchoring the support members 22 is dimensioned tofitbetween the support meme,

4 and 23 to the cylinder II is provided by a cap member 33 which is threadably engaged to the rear end of the cylinder II. The threaded cap member 33 has a central opening slightly larger than the cross section of rod I4, so as to permit the rod I4 to slide through the cap member. On diametrically opposite sides of the central opening there. are two T-shaped openings 26 and 27 extending through the wall of the cap member. Openings 26 and 2'! are arranged so that the stem portion of each respective T-shaped opening is directed radially outward and the broad or base portions of each opening are di rected toward each other.

The inner or forward ends of support members 22 and 23 are notched to provide a T-shaped end on each of the support members 22 and 23. The shape of the forward end of support member 22 is shown in Figure 8. The forward end of support member 23 is similar to that shown in Figure'8. The shapes of the forward ends of support members 22 and 23 are complementary to T-shaped openings 26 and 21, in that the broad ends of members 22 and 23 may be moved longitudinally through the broad or wide portions of the T-shaped openings 26 and 21. The narrow neck of the notched ends of members 22 and 23 is adapted to fit in the stem or narrow portion oi openings 28 and 21. Thus by inserting members 22 and 23 into the broad or base portion of T-shaped openings 26 and 27 to where the neck or narrow portion of members 22 and 23 are aligned with the stem or narrow portions of openings 26 and 21 and the outward radial displacement of members 22 and 23, there is provided a locking of support members 22 and 23 to cap member 33. To hold the support members 22 and 23 radially outward in interlocked engagement with the cap member 33, a spacer disk 28 is provided. This spacer disk 28 has a central opening slightly larger than the cross-sectional dimension of rod I4 and permits the rod I4 to move through the central opening. The spacer disk 28 bers 22 and 23.next: adjacent to, and rearwardly of, the cap member 3.3, and to hold the support members 22 and 23'o11t in interlocked position, thereby anchoring the support members 22 and 23 to cap member 33.

A resilient coil spring 2I is-positioned'on rod I4 intermediate of the spacer disk 28 and the feeding plate 26, whereby the feeding plate 26 is resiliently urged rearwardly and in a plane at right angles to the axis of rod I4 and thus in a position whereby the feeding plate 25 does not j grip the rod I4 and relative movement between feeding plate 26 and rod I4 is provided. Operation of levers I5 and I5 by inward movement of the handle overcomes the resiliency of spring 2I and provides for the tilting or cooking of feeding plate 2% into gripping engagement with rod I 4,

and for the forward advancement of rod !4 by the forwardly moving feeding plate 28.

To provide for the retention of thegain made by the piston rod M in itsstep-by-ste forward movements, a detent plate 29 is provided. Detent plate29 is positioned rearwardly of the feeding plate 26 and extends transversely of rod I4 intermediate the handles of operating crank arm levers I5 and I6.

largerthan, the, cross section of .rod I4. When 7:; ing in the detent plate; Upon swinging of detent The detent plate 29 is provided with an opening complementary to, and slightly assume blade; backwardly from. this; right angle position. to. a. tilted orcooked position, the: edges; of: the: opening; of detent: plate; 29; grip; and irictionally engage; the surface of; rod Ht to. prevent: its rearward movement.

A. support. member 3.11 is; provided for detent. plate 29, and a. pivot connection. 3|: 1s. provided. whereby the detent-plate: 29 is pivotallyconnects-- edto therearwardend of support member 3.9. to Permit; the detent plate: to swing from its right: an le position to: its tilted. or cooked position. The relationship of. the detentplate 2.9 to; the rod. 114, is: such that upon forward. movement or the rod. It by actionv otthe fieeding. plate 20. any frictional: engagementbetween rod l4 and detent; plate 29, causes the. detent plate 2.9 to, movetov its right angle or non-gripping; position. However; any rearward movement of rod M when detent plateis free to. swing on; pivot connection: 31 provides a frictional engagement between, the deent. plate and rod an a: locking. of; the rod. l4

against rearward movement.

' At. the outer or free end or the; detent late 29 a handle, 32 is provided; This hand-1s 32. is, pref, erably made of the same piece of. metal as detentplate 29 and is formedby bending the piece of. metal; at an angle, whereby handle 32 is; atrigh-t angles to detent plate. 29, Handle 32; isv a release:

handle, inthat radial inward pressure. on the end of handle; 32 swings detent, plate, 25 to its right angle or non-grinnin Position and, hence out of engagement with rod 1-4.. Upon release. of. handle 32 detent; plate 291s; free to swing on piyot 31 and to,- perform. its: detent function. When it; is; desired to- Withdraw the.- piston L3 o its, rearward position, ..the detent plate 2-}! released and put in hour-operating condition by moving inwardly the handle 32. After release of the rod by the detent the rearward endoi. rod M1 may be; grasped a d Pulled backwardly relative to the, cylinder LI...v thus retracting the piston l3,.. The piston; I;3

is: thusv retracted- When, the cylinder H is to be recharged with plastic, material such as caulking material, or grease. V

.The: support. member; alt for detent. plate 29; is-also anchored to and; carried-by cap member 331, as were support. members? 22 and 23' of operat-.- ing. levers. The: T-s'na-ped. opening 3A is. provided, in; cap. member 3,3 andv the. notched end ofjsupport member- 3B, as. shown in Figure, 9;. is. adapted. to. h

compleinentarily engage. and lock inthe opening 3 The p cer isk. 381s. mensioned to. hare. its; outer peripheral. boundary overlap th large broad p rti n ofopon-ing. 34 s does in, re pect to openings 26 and, 2:1,. nd. to lock. the support member an, radially outward. in; interlocked one easem nt w t nm m or 3. It: is; to be noted that release handle 32. extends: forwardly-and. intermediate the handle to. a can uen-ient position for rrianipulationor therelease handlezbythe: operator gripping, the operating le.-. vejrsv t5 and [6... Inth-is. convenient, location; the thumb; of the operator mayreadilypress: the re lease handle 32 downwardly to releasing; position his hand isstill; r p ng the p ratinglovers Als e. el as handle. 32. is posit o ed adjacent; the rear end-ofthe cylinder in. a. conven ient; position for: clashing the rearoi; the, cylin: demand the: release. handle 3.2 in. one hand While the other hand grasps; the rear end of the piston. rod 14 for r arward; movement of the piston. rod pon; retracti n of t p ton :3,. as dur n loading of the gun.

A small coil spring 35 is positioned around the. rod; M; in; a; loose fit. intermediate the collar the I I28; and the; detent plate; 29; forresiliently ur ing; the detent. plate rearwardly in. a; cocked ortilted position, whereby the. detent plate holds the rod I245. against. rearward movement unless, and untiL, the.- release.- handle 32 overcomes: the resilient ac.= tion of spring 35 to swing the detentplate 29. to.-- wardsv its right angle or non-gripping position,

To. limit. the. outward movementof. the.- handles: provided by the outer arms of, levers l5 and 16. for the most convenient. grasping of the handlesby the operators. hand, a. spacer block. 36 loosely mounted on the rod I4 is positioned between spring 35 and the detent plate 29, as illustrated in the drawing. The detentplate 29 in its,rear-- ward position provides. an abutment for the spacer; block 36;. which in. turn provides an abutment:- for the. rear end of spring. 35. The arrangement is-such that the collar [8 is urged forwardly rela tiveto the: detent. plate 29;. This tends to keep the handles oifthe lever 15 and, it? from spreading apart too far for convenient grasping bythe.

hand. The tensions of coil springs 2| and 35. are so balanced relative. to each other that the collar- 48 and feeding plate 26. are normally held in such a position that the. feeding. plate 20 is: held at a right angle to rod [4. ornon-gripping. position when the operating levers. are in their normal spread-apart position, such as shown. in Figure 2. s

The disposition of the levers l5 and I6 and their arrangement relative to the rod l4 provides. for a convenient and easy use of the gun. The gun may be readily operated with either hand, maybe turned, twisted and swung around by the. operator in use, and easily manipulated in a manner not heretofore obtainable. The limitations in use of guns having. a trigger or operating lever disposed at right angles to the piston rod are not present in the arrangement and structure of my gun. There are many advantages in use by reason. of the arrangement and disposition of the parts which will be apparent. to those knowing the problems of using such guns. in everyday practice. v

My structure also lends itself to quick, ready and economical assembly inthe fabrication of the gun. It is to be noted that the support members 22, 23 and 38am quickly and easily anchored to the cap member 33- without the use of weld ing,threaded bolts and the like. The parts may: be quickly assembled and disassembled with a minimum of effort, and parts may be replaced independently of other parts to be retained.

To assemble the operating parts of my gun,

' the piston rod M is used as the core or fixture upon which the several parts are assembled. Prior to the threadable engagement of the piston rod M to the piston l3, and prior to the insertion of the rod- M in the cylinder H, the several parts carried on rod M are slid over the forward end of the'rod l4 onto the rod in their proper sequence. The detent plate 2! the spacercollar 36, the spring 3'5, the-collar [8, the feeding plate 20, the spring 2|, the spacer disk 28, and

. cap member- 33v are arranged on the rod It in proper order. The levers l5 and I6, pivotally connected to support members 22 and 23, are placed in position, and bolts IQ. pivotally connect the levers together and to the collar i8.

The. supportmember so, pivotally connected to detent plate 29, is aligned along with support members 22 and. 23 parallel to the. axis of the cylinder. Spring 2|. is compressed tov permit the spacer disk 28 to be manually moved rearwardly.

wa-nct support members 22. and 2?.- are. positionedin.

asezrze respective openings 25 and El, and at the same time support member 38 is positioned in opening 34. The support members 22, 23 and 30 are moved radially outward and the disk 28 is moved forwardly against the cap member 33 and held in position by spring 2i. After this assembly of the operating parts to cap member 33, the piston 13 is threadably engaged to the forward end of the rod H1. The piston 13 and forward end of M are then inserted in the open end of cylinder ii, and the cap member 33 is threadably engaged to the rearward end of the cy "rider H.

To retract the piston l3 rearwardly in the cylinder, the release lever 32 is pressed downwardly towards the cylinder and the rearward end of rod I4 is grasped and moved rearwardly. To dispense plastic material the release handle 32 is released to place the detent plate 29 in operation, and the handles on the outer arms of levers l5 and Iii are grasped in the hand of the operator and repeatedly squeezed to move them together. In each squeezing operation whereby the handles are moved towards each other, the feeding plate 23 moves the rod 54 forwardly in a .sequence of increments, and the piston i3 is thus advanced to eject plastic material out through the nozzle i2. By reason of the pressure built up in the cylinder on the plastic material, the plastic material will tend to flow from the nozzle l2; In ending a dispensing operation the operator may desire to immediately cut ofi the flow of material from the nozzle. To obtain this quick cut-off, the release handle 32 is pressed downwardly toward the cylinder which causes the detent plate to release the rod It and allows the built-up pressure on the material in the cylinder to be released or dissipated, and the fiow of material out of the nozzle is terminated. The positioning and relationship of the operating handle and the release handle is such that a quick change from dispensing material to a cut-off of the material may be readily effected with the one hand grasping the levers.

This description includes the disclosure contained in the appended claims which are incorporated by reference in this description.

Although my invention has been described with a certain degree of particularity in its preferred form, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangem nt of parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.

What is claimed is:

1. In a dispensing gun for plastic material, said gun having a cylinder for holding said material, a piston in said cylinder for moving said material, and a piston rod extending axially of,

and rearwardly from, said cylinder for reciprocating said piston, the improvement comprising in combination a feeding plate carried on said rod and adapted to frictionally grip and move said rod forwardly upon forward movement of the feeding plate and to free, and move relative to, said rodupon rearward movement of the feeding plate, a pair of bell-crank levers, said levers having inner arms extending toward each other and pivotally interconnected and having outer arms extending rearwardly of said gun and in hand-gripping relationship to each other whereby movement of said outer arms toward each other moves said inner arms forwardly, engaging means carried by one of said inner arms and adapted to engage and forwardly move saidfeed ing plate upon forward movement of said inner arms, a pivot mounting for each of said bellcrank levers, a pair of support members extending rearwardly from said cylinder and each carrying one of said pivot mountings at a position rearwardly of said cylinder, said pivot mountings being movable relative to each other upon movement of said bell-crank arms, anchoring means carried by said cylinder for securing the forward end of each said support member to said cylinder, resilient means for resiliently urging said feeding plate and inner arms in a rearward direction, a detent plate carried on said rod and adapted to frictionally grip and hold said rod against rearward movement upon rearward movement of the detent plate and to free, and move relative to, said rodupon forward movement of the detent plate, areleasin'g handle connected to said detent plate and dis posed longitudinally-of said gun, a pivot mounting for said detent plate, a support member extending rearwardly from said cylinder and carrying said pivot mounting at a position rearwardly of said cylinder, anchoring means carried by said cylinder for securing the forward end of said support member to said 'cylindergand; resilient means for resiliently urging said detent plate in a rearward direction, the arrangement of the feeding plate and detent plate being suchthat upon each movement of said outer arms toward each other the feeding plate moves the said rod forwardly free of said detent plate, and upon return movement of said outer arms away from each other the detent plate grips the said rod to maintain the advance gain made by saidfeecling plate.

2. In a gun for dispensing plastic material, said gun having a cylinder and a piston rod extending rearwardly therefrom, improved mechanism comprising in combination a feeding plate grippingly engageable with said rod for moving said rod in a forward direction, a pair of levers," said levers respectively having handle portions extending rearwardly of the gun and arranged to be moved toward each by hand gripping and having operating portions extending toward each other and pivotally interconnected, one of said operating portions bein adapted to engage and forwardly move said feeding plate upon move{ ment of said handle portions toward each other,

a support member extending rearwardly from said cylinder for each said lever, said support members, respectively, providing fulcrum sup ports for said levers and being arranged to flex 'to accommodate movement of said inter'con-' nected levers relative to each other, a detent plate grippingly engageable with said rod for main taining the gain in forward movement of said said feeding plate to non-rod-gripping position and said detent plate to rod-gripping position, and a cap member adapted to be carried by said cylinder and engaging the forward end of each of said support members for securin the same in position.

3. In a gun for dispensing plastic materla "9 said gun havinga cylinder and a piston rod extending rearwardly therefrom, a feeding plate -1'or progressively advancing said rod forwardly and a detent plate for maintainingthe advance of said d; thciin-prcv ment, comprisin i bination a cap member adapted to threadably engage. the. rear end portion, of said cylinder, said cap member having a central opening for accommodatin said rod and three spaced openings extending therethrough at radial distances from said central opening, three support members disposed substantially parallel to the axis of said cylinder and having their forward ends positioned in said openings, said openings and said forward ends having complementary interlocking portions adapted to interlock said support members to said cap member upon radially outward positioning of said support members in said openings, a spacer member positioned adjacent said cap member and intermediate said support members for holding said support members in radially outward position and interlocked with said cap member, a pair of operating crank-arm levers positioned on opposite sides of said rod and pivotally interconnected with each other at a position adjacent said rod, said levers being adapted to actuate said feeding plate, two of said support members being connected to said levers, respectively, to provide fulcrum support to said levers, said two support members being adapted to permit pivotal swinging of said levers relative to each other for actuating said feeding plate and to accommodate the lateral movement of the fulcrum supports of said levers toward and away from each other upon pivotal swinging of said levers relative to each other, and a releasing handle connected to said detent plate and carried by the third of said support members, said third support member being adapted to permit angular swinging of said detent plate relative to said rod.

4. In a. gun for dispensing plastic material, said gun having a cylinder, a piston rod extending rearwardly of the cylinder, a pair of operating levers for advancing said rod, and a release lever for releasing said rod, an improved supporting structure for said operating levers and said release lever comprising in combination a cap member adapted to be threadably engaged to said cylinder at the rearward end thereof, said cap member having a central open space adapted to accommodate said rod and having three T- shaped openings spaced apart and extending through said cap member, the stem portions of said T-shaped openings, respectively, being directed radially outward, three support members extended rearwardly from said cylinder and disposed substantially parallel to the axis of said cylinder, the said support members having reduced portions adjacent the forward ends thereof, said reduced portions being formed to complementarily interengage in the stem portions of said openings for locking said support members against longitudinal movement relative to said cap member, a spacer member positioned rearwardly of, and next adjacent, said cap member, said spacer member having an open space for accommodating said rod, said spacer member having a peripheral boundary portion positioned adjacent said support members to hold the same in said stem portions of said openings to lock said support members to said cap member, means connecting two of said support members to said operating levers at a first distance from said cap member, and means connecting the third or said support members to said release lever at. a second distance from said cap member.

5 In a gun for dispensing plastic. material, said gun having a. cylinder and a. piston rod extending rearwardly and axially of said cylinder, improved mechanism comprising a feeding plate for advancing said rod, a pair of crank-arm levers positioned at: a distance from said cylinder and disposed on opposite sides of said rod, said crank-arm levers having inner arms adapted to actuate said feeding plate and having outer arms providing handles movable relative to each other by hand gripping, a fulcrum support carried by said cylinder for each said lever for providing a fulcrum for each said lever at a distance from said cylinder, first means interconnecting said inner arms and providing for the simultaneous swinging movement of said inner arms in unison on said first means and relative to each other, and second means providin for limited lateral movement of said fulcrum supports relative to each other for accommodating the pivotal swinging of said levers on said fulcrums and on said first means.

6. In a gun for dispensing plastic material, said gun having a cylinder and a piston rod extending rearwardly from said cylinder, the

- improvement comprising in combination a feeding plate having an opening therethrough for accommodating said rod, said feeding plate being adapted to grip and advance said plate upon moving said feeding plate forwardly at a side of said rod, a collar member carried by said rod rearwardly of said feeding plate, a pair of crankarm levers each having an inner arm and an outer arm, said inner arms being directed toward each other and said outer arms being directed in a rearward direction, pivot means pivotally connecting said inner arms to said collar member, one of said inner arms extending to and beyond said rod to a position adjacent and rearwardly of said feeding plate at a side of said rod to engage the feeding plate, the said outer arms providing handles movable toward and away from each other, movement of said handles toward each other moving said one inner arm forwardly to move said feeding plate forwardly at a side of said rod, resilient means urging said feeding plate rearwardly and axially of said cylinder, support means carried by said cylinder for providing fulcrum support to said crank-arm levers at positions rearwardly of said cylinder and on opposite sides of said rod.

7. Improved operating mechanism for a plastic material dispensing gun having a cylinder and a piston rod extending axially and rearwardly of said cylinder, comprising in combination a feeding plate mounted on said rod for stepby-step advancing of said rod, a detent plate mounted on said rod for retaining the gain of said rod as advanced by said feeding plate, a pair of handles disposed on opposite sides of said rod and extending rearwardly from said cylinder, said handles having portions cooperating to actuate said feeding plate for advancing said rod upon movement of said handles toward each other, a support member for each said handle, each support member being carried by,

and disposed rearwardly of, said cylinder, said support members providing a fulcrum support for each said handle movable in a lateral direc tion to accommodate changes in the position of the respective fulcrums, another support member for said detent plate, said another support member being carried by, and disposed rearwardly "11 12 of said cylinder, said another support member providing a pivot support for said detent plate REFERENCES CITED for swinging of said detent platerelative to said The f01 l0Wir1g e e ences are of record in the rod, 2. release handle carried by'; and movable file 0f thls P with said detent plate, said release handle being 5 UNITED STATES PATENTS directed, longitudinally of said rod toward said cylinder, and resilient means carried by said f gg i g J 55 2 rod for urging said feeding plate and detent 1,986,166 Schneider Jan- 1935 plate in a rearward direction.

CLEM STROHMEIER m 2,o67,346 Good Jan. 16, 1945 

